Kuznetsov, V. V. published the artcileSpectrophotometric titrimetry of nitrogen-containing heteroaromatic sulfonates in organo-aqueous solutions, Computed Properties of 636-73-7, the publication is Zhurnal Analiticheskoi Khimii (1990), 45(11), 2204-10, database is CAplus.
The formation constants and free energy of transfer of Ba complexes with 8-quinolinol-2-, 8-quinolinol-5-, and 3-pyridinesulfonates in H2O-Me2CO were examined by potentiometry and a method was developed for determining the sulfonates in the presence of sulfates. The method involves titration with BaCl2 vs. Orthanilic B.
Zhurnal Analiticheskoi Khimii published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Computed Properties of 636-73-7.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem